// 定义常亮
const val APPLICATION_NAME = "Kotlin";

fun main(args: Array<String>) {

    var str = "Hello world";
    println(str)

    var name: String = "Hello";
    println(name)

    var gendle: Char = 'M';
    println(gendle)

    var isStudent: Boolean = true;
    println(isStudent)

    var experiencePoints: Int = 4;
    println(experiencePoints)

    var weight: Double = 80.5;
    println(weight)

    weight = 99.9;
    println(weight)

    var list: List<Int> = listOf(1, 2, 3, 4, 5);
    println(list)

    var set: Set<String> = setOf("a", "b", "c");
    println(set)

    var map: Map<String, Int> = mapOf("a" to 1, "b" to 2, "c" to 3);
    println(map)


    val PI = 3.14
    println(PI)
}